• feat: #2275 setupDragIn() now can take an array of elements (in addition to selector string) and optional parent root (for shadow DOM support)
• fix: #2234 Utils.getElements('1') (called by removeWidget() and others) now checks for digit 'selector' (becomes an id).
• fix: #2213 destroy() now removes event handlers too
• feat: #2292 ne nw resize handle
• break: (meant to be in v8) removed GridStackOptions.dragInOptions since setupDragIn()has it replaced since 4.0